Photo by Paul Kumm

If you're itching for some mountain bike racing, the Four Seasons of Horsetooth Mountain Bike Challenge starts tomorrow. The following announcement was copied and pasted from the 4SOH Facebook page. 
The 7th annual Four Seasons of Horsetooth Mountain Bike Challenge kicks off with the Fall Stage beginning this Friday, September 18. They’re sticking with the Friday-Monday window for the 7th Edition, so the last day to complete the Stage is Monday, September 21.
Whether you are a first-timer or seasoned 4SOH’er, be sure to read the rules page at There are lots of other resources on the website like route maps, cue sheets, downloadable GPX files, links to online and app-based mapping resources like MTB Project and Trailforks, past stage results, World Records, and Beet Juice curated Stage Mixes (2017-2018 Spring is my personal favorite).
The Fall Stage weather forecast looks perfect and hopefully, the wildfire smoke won’t be too bad. 


Full race information here:

The Four Seasons of Horsetooth Mountain Bike Challenge is a grass-roots un-event with no entry fees and no real start times and is ridden on the two solstices and two equinoxes in Horsetooth Mountain Park and Lory State Park. By being required to complete at least three seasonal stages, we hope it encourages you to come ride if your schedule doesn’t permit on any given stage. The course is designed to offer what we think are the best sections of trail in our backyard. The course should take about 2-3 hours. Had fun in the autumn? Bring a friend for the winter stage! Don’t own a fancy team kit or 20lb race bike? Neither do we! Come ride for the fun and challenge of completing all four events! Check out the rules below. 


  1. Stages of the Four Seasons of Horsetooth Mountain Bike Stage Challenge must be completed on Friday, Saturday, Sunday or Monday of the solstice or equinox week per the schedule below. The half-assed excuse for the Leader’s Jersey will be awarded after each stage and transferred as needed after each subsequent stage.

  2. The Four Seasons. Competitors must complete any three of the four stages each year to have his/her time count towards the amazing grand prize which doesn’t actually exist yet…but could be a nice pair of socks.

    1. All attempts will be made to hold each seasonal stage on the season’s equinox or solstice weekend, the preceding Friday and following Monday. The Course Director (currently, Jordan Radin) will decide whether to shift the season’s stage depending on weather (wet trails) and other events in the Park (that damn running race). See the FAQs for more info about extended stages.

    2. Tentative Stage Dates for 2020/21

    • Autumn – September  18-21

    • Winter – December 

    • Spring – March 

    • Summer – June

  3. Timing.

    1. Competitors must finish at least three of the Four Season stage dates to enter a time. His/her finish time will represent the cumulative time of any three stages completed.

    2. Should a Competitor complete all four seasons, he/she can take 10 minutes from the aggregate of his/her top three times.

    3. Results will be posted within an administratively feasible time on this website here.

  4. Don’t Be a Tool. This is like, uh grass roots and stuff.

    1. All Competitors will be required to use some sort of GPS tracking device such as Strava or Garmin Connect and share the link with the 4SOH Director. The 4SOH Director has created a Four Seasons segment in Strava and in Garmin Connect. Additional resources can be found here. Send your ride link or gpx file here by 12:00 p.m. Mountain on the Tuesday following the stage. You can also submit it through the Contact page of this website here.

    2. This, err, “event” is free but you are riding in Horsetooth Mountain Park and Lory State Park, both of which require fees or a yearly pass to ride there. Either pay or if you are cheap like me, ride with a friend with a yearly pass! You can be cheap but not a tool.

    3. Don’t be a tool and run over hikers or spook horses just to get a better time.

    4. Don’t be mean to the Course Director or he may donkey-kick you….in the face.

    5. Don’t cheat and cut the course or use digital EPO services.

    6. Lance – this isn’t UCI yet so come on down.

  5. The Course. The course is the same for each season. The Course must be ridden starting at the Timber trailhead in Lory State Park. Any submissions from any other starting points will not count. Check out all of the amazing course resources here.

    1. The Course Director has the final say on the course (see “Don’t Be a Tool” above.)

    2. Any changes made to the course due to fire, butterfly migrations, etc. will be up to the Course Director and posted/emailed as soon as possible. You can also check on the event's Facebook page.

  6. Don’t Sue Us.

    1. This isn’t actually a race or any kind of organized event Officer, we’re all just out here coincidence like.

    2. Don’t make me use a waiver.

  7. Miscellaneous.

    1. This event is completely self-supported. There are no aid stations or erubescent-cheeked volunteers shouting encouragement or offering bacon. There is year-round water in a few locations along the way and we encourage you to locate them.

    2. You can use different bikes for different stages.

    3. SSers can use different gears for different stages but you will most likely suffer from personal demons and feelings of inadequacy thereafter.

    4. Assuming you get the requisite park permits, film crews are allowed, nay encouraged.

    5. We’re making all this shit up as we go so be nice